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what is this tmp disk btop is showing me? (OS: Kubuntu 25.10) (media.piefed.social)
submitted 1 week ago* (last edited 1 week ago) by bad1080@piefed.social to c/linux@lemmy.ml
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i have only one internal ssd and no external drives are connected

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[-] bad1080@piefed.social 1 points 1 week ago* (last edited 1 week ago)

it lists multiple tmpfs:

tmpfs on /run type tmpfs (rw,nosuid,nodev,noexec,relatime,size=1616504k,mode=755,inode64)  
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,inode64)  
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k,inode64)  
tmpfs on /run/credentials/systemd-journald.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)  
tmpfs on /run/credentials/systemd-resolved.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)  
**tmpfs on /tmp type tmpfs (rw,noatime,inode64)** (i am guessing it's this one)  
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=1616500k,nr_inodes=404125,mode=700,uid=1000,gid=1000,inode64)  
tmpfs on /run/snapd/ns type tmpfs (rw,nosuid,nodev,noexec,relatime,size=1616504k,mode=755,inode64)

i hope these are all as konsole doesn't seem to have a search function in kubuntu, why?

[-] dennajort@sh.itjust.works 13 points 1 week ago

You are correct this is the one mounted on /tmp.

Everything under /run and /dev is normal to be on tmpfs and should not be changed.

In Linux, a lot of internal systems and devices are considered as files even if they are not really a file in the usual sense of it. For example what is in /dev is usually not really taking up RAM space but more of a representation of the devices (internal and external) that are attached to your system. You can programatically read and write to these "files" to communicate with the devices.

[-] funkajunk@lemmy.world 8 points 1 week ago

In Linux, everything is a file

[-] eager_eagle@lemmy.world 3 points 1 week ago

for a more readable output

df -ht tmpfs

[-] bad1080@piefed.social 1 points 1 week ago

thanks! but it's unclear how to tell it lives in RAM...

Filesystem      Size  Used Avail Use% Mounted on
tmpfs           1,6G  2,2M  1,6G   1% /run
tmpfs           7,8G  1,5G  6,3G  19% /dev/shm
tmpfs           5,0M  8,0K  5,0M   1% /run/lock
tmpfs           1,0M     0  1,0M   0% /run/credentials/systemd-journald.service
tmpfs           1,0M     0  1,0M   0% /run/credentials/systemd-resolved.service
tmpfs           7,8G  236M  7,5G   3% /tmp
tmpfs           1,6G   11M  1,6G   1% /run/user/1000
[-] eager_eagle@lemmy.world 10 points 1 week ago* (last edited 1 week ago)

tmpfs is a memory filesystem, they all do

https://man7.org/linux/man-pages/man5/tmpfs.5.html

one-liner to get the total used size

/usr/bin/df --type=tmpfs | awk 'NR>1 {sum+=$3} END {print "tmpfs used (MiB): " sum / 1024}'
this post was submitted on 20 Mar 2026
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